Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 661 | Count Triplets That Can Form Two Arrays of Equal XOR | Medium | ArrayHash TableMath |
| 662 | Count Triplets with Even XOR Set Bits I | Easy | ArrayBit Manipulation |
| 663 | Count Triplets with Even XOR Set Bits II | Medium | ArrayBit Manipulation |
| 664 | Count Unguarded Cells in the Grid | Medium | ArrayMatrixSimulation |
| 665 | Count Unhappy Friends | Medium | ArraySimulation |
| 666 | Count Unique Characters of All Substrings of a Given String | Hard | Hash TableStringDynamic Programming |
| 667 | Count Univalue Subtrees | Medium | TreeDepth-First SearchBinary Tree |
| 668 | Count Unreachable Pairs of Nodes in an Undirected Graph | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 669 | Count Valid Paths in a Tree | Hard | MathDynamic ProgrammingTree |
| 670 | Count Visited Nodes in a Directed Graph | Hard | Dynamic ProgrammingGraphMemoization |
| 671 | Count Vowel Strings in Ranges | Medium | ArrayStringPrefix Sum |
| 672 | Count Vowel Substrings of a String | Easy | Hash TableString |
| 673 | Count Vowels Permutation | Hard | Dynamic Programming |
| 674 | Count Ways To Build Good Strings | Medium | Dynamic Programming |
| 675 | Count Ways to Build Rooms in an Ant Colony | Hard | MathDynamic ProgrammingTree |
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